文献类型：期刊文献

英文题名：Structural Characteristics of Asphaltenes Derived from Condensation of Maltenes in Supercritical Water

作者：Zhu, Dao-Qi[1];Liu, Qing-Kun[1];Tan, Xue-Cai[1];Yang, Jing-Yi[1];Yuan, Pei-Qing[1];Cheng, Zhen-Min[1];Yuan, Wei-Kang[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：29

期号：12

起止页码：7807

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20155201715169);WOS:【SCI-EXPANDED(收录号:WOS:000366878000007)】；

基金：This work was supported by the Open Project of State Key Laboratory of Chemical Engineering (No. SKL-ChE-13C02) and the National Natural Science Foundation of China (Grant No. 21376075).

语种：英文

外文关键词：Aromatic compounds - Free radical reactions - Reaction kinetics - Condensation - Aromatization

摘要：Asphaltenes derived from the condensation of maltenes under high-pressure N-2 and supercritical water (SCW) environments were characterized with various approaches. The reaction kinetics of the condensation of asphaltenes under hydrothermal environments were also measured. By improving the diffusivity of hydrocarbon species and the isolation of aromatic carbon radicals from hydrogen donors in the SCW phase, the dealkylation of alkyl substitutes and the condensation of aromatic rings involved in the condensation of maltenes are promoted. Consequently, asphaltenes formed in the SCW phase (As-SCW) have a higher aromaticity and lower alkyl and naphthenic fractions than asphaltenes formed in the oil phase (As-oil). Nevertheless, As-SCW and As-oil both present a cokelike supermolecular structure with the stacking of polycyclic aromatic rings. Benefitting from the highly fused aromatic molecular structure and the cokelike supermolecular structure, the condensation of As-SCW to coke occurs readily under hydrothermal environments, significantly faster than that of As-oil.